| 1. | Ppm : pulse - position modulation
讨论了基于脉冲位置调制 |
| 2. | Pulse position system
脉冲位置制脉位制 |
| 3. | Pulse position modulation
脉冲位置灯 |
| 4. | The enhanced preamble detection must get the start time of the signal by the detection of valid pulse position and lead edge
报头检测的任务是检测有效脉冲位置和上升沿检测,从而确认一个四脉冲的报头,得到信号的到达时间。 |
| 5. | This system realize the chaos arithmetic directly by hardware and non - chaos synchronization communication by chaotic pulse position modulation technology
该系统直接用硬件实现混沌迭代算法，运用混沌脉冲位置调制技术实现无混沌同步通信。 |
| 6. | This system based on logisitic map . it designs a chaos sequence generator and realizes the modulation and demodulation of chaotic pulse position by hardware
本系统基于logistic映射，构造混沌序列发生器，用硬件算法实现混沌脉冲位置的调制和解调。 |
| 7. | Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance , system capacity and power spectrum density . on the basis of those analyses , we study the pulse shape and the anti - jamming ability of the system . at last , multiple access with pseudochaotic time hopping is introduce
本文首先阐述了uwb脉冲通信系统的基本原理，重点介绍了用伪随机码跳时的ppm (脉冲位置调制)调制，分析了他的多址性能、系统容量和功率谱密度，在此基础上研究了改进性能的发射信号形状和系统抗干扰能力，最后介绍了伪混沌码跳时的多址方式。 |
| 8. | Based on the theory of nonlinear dynamics system , this paper discusses the theory about wireless chaos security communications and its history and status quo of development , then emphasizes the new communication technology - chaotic pulse position modulation , and the realization of non - chaos synchronization wireless security communication system using the technology
本文以非线性动力学系统理论为基础，论述了无线混沌保密通信的相关理论及发展历史和现状，并着重讲述了混沌脉冲位置调制( chaoticpulsepositionmodulation )这一新颖的通信技术，和利用此技术实现的无混沌同步的无线保密通信系统。 |
| 9. | The system has a good security and can prevent the pervasion of mistake code , has a well anti - jamming ability and so on . some substantial and groping work has been done in the process of using chaos security communication in pulse wireless system and the multi - access communication of chaotic pulse position modulation
系统具有很高的保密性，具有防误码扩散，抗干扰能力强等特点，同时也为混沌保密通信应用于脉冲无线电系统以及混沌脉冲位置调制的多址通信方面做了一些实质性和探索性的工作。 |
